Integrated optical isolators using magnetic surface plasmon (Presentation Recording)

Hiromasa Shimizu; Terunori Kaihara; Saori Umetsu; Masashi Hosoda

doi:10.1117/12.2187776

5 October 2015 Integrated optical isolators using magnetic surface plasmon (Presentation Recording)

Hiromasa Shimizu, Terunori Kaihara, Saori Umetsu, Masashi Hosoda

Proceedings Volume 9551, Spintronics VIII; 955122 (2015) https://doi.org/10.1117/12.2187776
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

Optical isolators are one of the essential components to protect semiconductor laser diodes (LDs) from backward reflected light in integrated optics. In order to realize optical isolators, nonreciprocal propagation of light is necessary, which can be realized by magnetic materials. Semiconductor optical isolators have been strongly desired on Si and III/V waveguides. We have developed semiconductor optical isolators based on nonreciprocal loss owing to transverse magneto-optic Kerr effect, where the ferromagnetic metals are deposited on semiconductor optical waveguides1). Use of surface plasmon polariton at the interface of ferromagnetic metal and insulator leads to stronger optical confinement and magneto-optic effect. It is possible to modulate the optical confinement by changing the magnetic field direction, thus optical isolator operation is proposed2, 3). We have investigated surface plasmons at the interfaces between ferrimagnetic garnet/gold film, and applications to waveguide optical isolators. We assumed waveguides composed of Au/Si(38.63nm)/Ce:YIG(1700nm)/Si(220nm)/Si , and calculated the coupling lengths between Au/Si(38.63nm)/Ce:YIG plasmonic waveguide and Ce:YIG/Si(220nm)/Si waveguide for transversely magnetized Ce:YIG with forward and backward directions. The coupling length was calculated to 232.1um for backward propagating light. On the other hand, the coupling was not complete, and the length was calculated to 175.5um. The optical isolation by using the nonreciprocal coupling and propagation loss was calculated to be 43.7dB when the length of plasmonic waveguide is 700um. 1) H. Shimizu et al., J. Lightwave Technol. 24, 38 (2006). 2) V. Zayets et al., Materials, 5, 857-871 (2012). 3) J. Montoya, et al, J. Appl. Phys. 106, 023108, (2009).

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Hiromasa Shimizu, Terunori Kaihara, Saori Umetsu, and Masashi Hosoda "Integrated optical isolators using magnetic surface plasmon (Presentation Recording)", Proc. SPIE 9551, Spintronics VIII, 955122 (5 October 2015); https://doi.org/10.1117/12.2187776

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KEYWORDS

Optical isolators

Waveguides

Magnetism

Integrated optics

Light wave propagation

Magnetic semiconductors

Optical semiconductors

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